What is the DLC System?
The DLC system combines a measuring and control system with a newly developed
Dynamic Load sensor. It was
created to reduce a major contributor to calibration errors.
A dry-block instrument has some inherent error mechanisms, including the affect on calibration accuracy that a
sensor under test may add. The sensor transmits energy to and from the calibrator. This heat exchange between
the calibrator and the environment has a considerable negative impact on the calibration accuracy. The extent
of the error depends on many factors, including sensor size (diameter and length), number of sensors in the
well, and the difference between calibration temperature and ambient temperature.
In other words, calibration accuracy is directly influenced by the actual load of the calibrator.
How Does the DLC System Work?
JOFRA temperature calibrators are already famous for their active dual-zone
calibration principle.
With the DLC system, we have taken this well-proven and acknowledged
dual-zone principle one step further. The load compensation is now active
both within the heating block and inside the insert during calibration.
The
DLC sensor measures the actual temperature difference between
two defined points inside the insert.
The DLC sensor is designed to provide input to the heat control system
of the calibrator to ensure that the axial gradient deviations in the lower
60 mm of the insert are kept to a minimum. The temperature difference
between the bottom and the zone at 60 mm from the bottom is controlled
within a few hundredths of a degree.
The
DLC system reacts immediately to changes in the load of the insert
and controls the heat distribution to achieve the minimum axial gradient.
Read the full technical note here.